Patent GB-1479235-A (GB)
Title: Ring-substituted pyrazino-isoquinoline derivatives
IPC: C07D217/14
Filed: 1975-08-27
Abstract: 1479235 Pyrazinoisoquinolines MERCK PATENT GmbH 27 Aug 1975 [28 Aug 1974] 35342/75 Heading C2C [Also in Division C4] The invention comprises compounds of the formula wherein R<SP>1</SP> is a hydrogen atom or a hydroxyl group or an alkyl radical, R<SP>2</SP> is a hydrogen atom or CYR<SP>9</SP>, R<SP>3</SP> is a hydrogen atom or an alkyl or hydroxyalkyl radical, R<SP>4</SP> is a hydrogen atom or an alkyl or phenyl radical, R<SP>5</SP> represents two hydrogen atoms or a hydrogen atom and a halogen atom or a hydroxyl group or a phenyl or alkyl radical or R<SP>6</SP> represents an oxygen atom, R<SP>6</SP> and R<SP>7</SP>, which can be the same or different, are hydrogen or halogen atoms or hydroxyl, nitro or cyano groups or alkyl, alkoxy, acyloxy, monoalkylamino, dialkylamino or acylamino radicals or Z, R<SP>8</SP> is a hydrogen atom or an alkyl radical, R<SP>9</SP> is a hydrogen atom or an alkyl radical containing up to 6 carbon atoms or a cycloalkyl or cycloalkenyl radical containing 5 to 7 carbon atoms which is either unsubstituted or is substituted by an oxygen atom or is substituted once or twice by R<SP>10</SP> and/or is interrupted in the ring by oxygen, sulphur, SO or SO 2 , or is a phenyl radical which is either unsubstituted or is substituted once or twice by R<SP>10</SP> or Z, or is a thienyl, pyridyl, phenoxy or R<SP>11</SP> radical, R<SP>10</SP> is a fluorine or chlorine atom or a hydroxyl, nitro or amino group or a monoalkylamino, dialkylamino or acylamino radical, R<SP>11</SP> is an alkoxy radical or a cycloalkoxy radical containing 5 to 7 carbon atoms, X and Y, which can be the same or different, are oxygen or sulphur atoms and Z is phenylazo or naphthylazo radical which is either unsubstituted or substituted by halogen, hydroxyl, alkyl, alkoxy, amino, monoalkylamino, dialkylamino, COOH and/or S0 3 H, and wherein the alkyl, hydroxyalkyl, alkoxy and acyl radicals each contain up to 4 carbon atoms, insofar as they are not otherwise defined, and wherein R<SP>2</SP> is CSR<SP>9</SP> or COR<SP>11</SP> when R<SP>1</SP> and R<SP>3</SP> to R<SP>8</SP> are all hydrogen atoms and X is an oxygen atom; and the physiologically compatible salts thereof, other than compounds of the formula wherein COR is an acyl radical containing up to 26 carbon atoms derived from an unsubstituted or substituted aliphatic, cycloaliphatic, cycloalkylaliphatic, anylaliphatic or heterocyclic carboxylic acid or a substituted aromatic carboxylic acid by removal of the hydroxyl group from the carboxylic radical; and the physiologically compatible salts, the quaternary ammonium salts and the optical antipodes thereof. The compounds may be prepared by (i) cyclizing compounds of the formulµ where E is a hydroxy group, a functionally changed hydroxy group or a halogen atom, under conditions which split off HE, (ii) treating a compound of the formula where R<SP>12</SP> has the same meaning as R<SP>5 </SP>or is an alkylidene radical containing up to 4 carbon atoms and the dotted lines indicate that in at least one of these places there can be a double bond, with the proviso that R<SP>12</SP> is an alkylidene radical when there is no double bond at any of these positions, or a salt thereof, with a reducing agent or (iii) treating a compound of the formula wherein R<SP>13</SP> is a hydrogen atom or COR<SP>14</SP>, R<SP>14</SP> is a hydrogen atom, an alkyl radical containing up to 6 carbon atoms or a cycloalkyl or cycloalkenyl radical containing 5 to 7 carbon atoms which is either unsubstituted or is substituted by oxygen or once or twice by R<SP>10</SP> and/or interrupted in the ring by oxygen, sulphur, SO or SO 2  or is a phenyl radical which is either unsubstituted or is substituted once or twice by R<SP>10</SP> or Z or is a thienyl or pyridyl radical with a hydroxylating, hydroxyalylating, halogenating or nitrating agent or with an agent giving off sulphur, or, when R<SP>13</SP> is a hydrogen atom, with a thioacylating agent or a compound of the formula R<SP>11</SP>-CO-E. Substituents R<SP>1</SP> to R<SP>8</SP> and X in the products may be replaced by other substituents R<SP>1</SP> to R<SP>8</SP> and X. The compounds may be used as anthelminitics. 1479239 Acylated 2-hydrazono formyl quinoxaline-1,4-dioxides EGYT GYOGYSZERVEGYESZETI GYAR 18 Nov 1975 [21 Nov 1975] 47418/75 Heading C2C Novel compounds of the Formula I wherein R is C 7-20  alkyl, phenyl substituted by up to 3 radicals selected from hydroxy, amino, nitro, C 1-3  alkoxy or halogen, naphthyl, hydroxy substituted naphthyl, ar-C 1-3 -alkyl, pyridyl, piperidyl, pyrazinyl, furyl, nitrofuryl, or α,α- diphenyl-α-hydroxymethyl, may be prepared by reacting an aldehyde or acetal of the Formula II wherein Z is oxygen or (0-alkyl) 2  with or reacting 2-formyl-quinoxaline-1,4-dioxidehydrazone with an acid halide RCOX. Pharmaceutical compositions of the compounds I with the usual excipients show bactericidal and weight-gain effects.